https://www.humblebundle.com/weekly

$1 = Cities XL Platinum, Divinity II: Developer's Cut, R.A.W. Realms of Ancient War, Game of Thrones, Confrontation & Blood Bowl: Legendary Edition

$6 = The Testament of Sherlock Holmes & Wargame: European Escalation

Tier 1 is one key, tier 2 is another key.